Nick Vivarelli International CorrespondentRevolutionary U.S. producer Jason Blum, known for shepherding hit horror franchises such as “Paranormal Activity” and “The Purge,” and more recently the films “Whiplash,” “Get Out,” and Spike Lee’s “BlacKkKlansman,” will be honored by the Locarno Film Festival with its Raimondo Rezzonico Prize for a producer who epitomizes the indie ethos.The prominent Swiss fest dedicated to international indie cinema will be celebrating Blum on its Piazza Grande square, which is Europe’s largest outdoor screening venue, on the evening of Aug.